js仿微信抢红包功能

本文实例为大家分享了js仿微信抢红包功能的具体代码，供大家参考，具体内容如下

<!DOCTYPE html>
<html>
 <head>
  <meta charset="UTF-8">
  <title>仿微信抢红包</title>
  <style>
   html,body,div{margin:0;padding:0;}
   body{background:#EAEAEA;font:16px/1.8 "微软雅黑";padding-bottom:20px}
   input{margin:0;display:inline-block;border:1px solid #ddd;padding:4px 2px;font-size:16px;font-family:"微软雅黑";margin-right: 5px;}
   input:focus{border-color:#3C9BD1;outline:none;}
   
   .wrap,.list { margin: 50px auto; width: 300px;}
   .title{ font-size: 42px; color: #464646;text-align: center;}
   .line{height:40px;line-height:40px;text-align: center;}
   .btn{display:block;background:#3C9BD1;color:#fff;line-height: 40px;height:40px;text-align: center;width:200px;margin:0 auto;margin-top:50px;text-decoration: none;transition:all .3s linear;border-radius: 2px;}
   .btn:hover{opacity:.9;}
   .list{width:500px;border:1px solid #DBDBDB;padding:10px;BACKGROUND:#F5F5F5;text-align: center;}
   .list p span {color: red; padding: 0 8px;}
   .list p:empty{background: #000000;}
   .list:empty{display: none;}
   .link{position:fixed;height:20px;font-size: 12px;color:#999;text-align: center;width: 100%;bottom:0;line-height:20px;margin:0;padding:0; background: #EAEAEA;padding:5px 0;}
   .link a{font-size:12px;color:#999;}
  </style>
 </head>
 <body>
  <h1 class="title">javascript实现仿微信抢红包</h1>
  <div class="wrap">
   <div class="line">红包个数：<input type="text" name="packetNumber" value="5" onkeyup="this.value=this.value.replace(/\D/g,'')" onafterpaste="this.value=this.value.replace(/\D/g,'')" maxlength="10">个</div>
   <div class="line">总&ensp;金&ensp;额：<input type="text" name="money" value="5" onkeyup="if(isNaN(value))execCommand('undo')" onafterpaste="if(isNaN(value))execCommand('undo')" maxlength="10">元</div>
   <div class="line"><a class="btn" href="javascript:;" rel="external nofollow" >发红包</a></div>
  </div>
  <div class="list"></div>
  <p class="link">参考<a target="_blank" href="https://www.zybuluo.com/yulin718/note/93148">《微信红包的架构设计简介》</a>文章</p>

<script>
 "use strict";

var _createClass = function() {
 function defineProperties(target, props) {
  for (var i = 0; i < props.length; i++) {
   var descriptor = props[i];
   descriptor.enumerable = descriptor.enumerable || false;
   descriptor.configurable = true;
   if ("value" in descriptor)
    descriptor.writable = true;
   Object.defineProperty(target, descriptor.key, descriptor);
  }
 }
 return function(Constructor, protoProps, staticProps) {
  if (protoProps)
   defineProperties(Constructor.prototype, protoProps);
  if (staticProps)
   defineProperties(Constructor, staticProps);
  return Constructor;
 }
 ;
}();

function _classCallCheck(instance, Constructor) {
 if (!(instance instanceof Constructor)) {
  throw new TypeError("Cannot call a class as a function");
 }
}

var MoneyPacket = function() {
 function MoneyPacket(packNumber, money) {
  _classCallCheck(this, MoneyPacket);
  
  this.min = 0.01;
  this.flag = true;
  this.packNumber = packNumber;
  this.money = money;
  if (!this.checkPackage()) {
   this.flag = false;
   return {
    "flag": this.flag
   };
  }
 }
 
 _createClass(MoneyPacket, [{
  key: "checkPackage",
  value: function checkPackage() {
   if (this.packNumber == 0) {
    alert("至少需要设置1个红包");
    return false;
   }
   if (this.money <= 0) {
    alert("红包总金额不能小于0");
    return false;
   }
   if (this.packNumber * this.min > this.money) {
    alert("单个红包金额不可低于0.01元");
    return false;
   }
   return true;
  }
 }]);
 
 return MoneyPacket;
}();

var getRandomMoney = function getRandomMoney(packet) {
 if (packet.packNumber == 0) {
  return;
 }
 if (packet.packNumber == 1) {
  var _lastMoney = Math.round(packet.money * 100) / 100;
  packet.packNumber--;
  packet.money = 0;
  return _lastMoney;
 }
 var min = 0.01
  , 
 max = packet.money / packet.packNumber * 2
  , 
 money = Math.random() * max;
 money = money < min ? min : money;
 money = Math.floor(money * 100) / 100;
 packet.packNumber--;
 packet.money = Math.round((packet.money - money) * 100) / 100;
 return money;
}
;

(function() {
 var oBtn = document.querySelector(".btn");
 var oList = document.querySelector(".list");
 
 oBtn.onclick = function() {
  var packetNumber = +document.querySelector("input[name=packetNumber]").value;
  var money = +document.querySelector("input[name=money]").value;
  var str = "";
  
  var packet = new MoneyPacket(packetNumber,money)
   , 
  num = packet.flag && packet.packNumber || 0;
  console.log("========================================================================");
  for (var i = 0; i < num; i++) {
   var _pack = getRandomMoney(packet);
   str += "<p>第<span>" + i + "</span>个红包:: <span>" + _pack.toFixed(2) + "</span>元&emsp;&emsp;==剩余红包:: <span>" + packet.money.toFixed(2) + "</span> 元<p>";
   console.log("第", i, "个红包::", _pack.toFixed(2), "元  ==剩余红包::", packet.money.toFixed(2), "元");
  }
  str !== "" && (oList.innerHTML = str);
 }
 ;
})();

</script>
 </body>
</html>

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持呐喊教程。

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